"You came! And you came for your House! You came for an emergency house call," Rep. Michele Bachmann, R-Minn., said before the cheering crowd, holding colorful signs and waving banners.

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"The Republicans don't have the votes to kill this bill. ... But what we knew was unlimited is the voice of persuasion of the American people. And that's why you're here today."

Bachmann had issued a last-minute appeal to activists to come to Washington during a conference call last week and in a subsequent appearance on Fox News. The House of Representatives will likely vote on the Democratic leadership's health care bill this weekend.

Dozens of buses, organized by the conservative group Americans for Prosperity carried grassroots activists and concerned citizens from Pennsylvania, New Jersey, Maryland and North Carolina. Organizers said activists became energized after Republican victories in Virginia and New Jersey Tuesday.

"Speaker Pelosi did not get the message on Tuesday that people aren't happy with the way things are going," Dave Schwartz, Maryland state director of Americans for Prosperity, told ABC News. "We need to send her another message."

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The message activists and House Republicans want to send is that Democrats' health care legislation is, in their view, an irresponsible and costly government takeover of health care.

"This bill is the greatest threat to freedom I've seen in the 19 years since I've been in Washington," House Minority Leader John Boehner, R-Ohio, told the crowd. "Join us in defeating 'Pelosi-Care!'"

Republicans Tout Health Care Bill Alternative

Price motioned to a tall stack of white copy paper bound with a yellow rope piled atop the podium and above the blue sign that read "Health Care Freedom" -- the theme of the Republicans' message today.

Rep. Roy Blunt, R-Mo., told the crowd, "Republicans have better ideas to give you more choices, more freedom in health care, access for everybody. We're going to fight for those ideas."

Republicans were joined by other notable public figures, including actor Jon Voight and radio host Mark Levin.

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"I'm so deeply proud to be among you brave, concerned, patriotic American citizens," Voight said. "The biggest vote in the U.S., the biggest voice in the U.S. is your voice, the voice of the American people."

Among the faces in the crowd were young people who took off work, parents with their teenage children and senior citizens.

Schwartz of Americans for Prosperity described today's rally as "very organic." Seven buses carrying 350 people traveled to Washington, D.C., from parts of Maryland. Hundreds more, he said, carpooled behind.

"We want reform, but not the heap of junk that's in this bill," Schwartz said.

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He expects that message will resonate with moderates and Blue Dog conservative Democrats who might still be on the fence about support for the House plan.

In New Jersey, hundreds of activists and concerned citizens piled into four tour buses to make the early morning trip to Washington.

During the ride south, Linda Giresi of Union, N.J., issued a warning to Democrats. "We're going to boot them the heck out next year and we're going to delay this bill," she said, eliciting impromptu cheers from people seated around her.

"The Democrats do not have the American people and their best interest at heart. ... [The bill is] a big ripoff, it's a scam, it's a big power grab. They want to dominate and control ... and we're sick of it!"

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Grassroots Activists Converge on D.C. by Bus

Janine Vorhees, who was also aboard the bus with her mother, Loretta, and her teenage son, Alexander, said she likes her health care plan and wants to keep it.

"We are fed up and teed off," she told ABC News. "The Constitution does not say we should provide health care. We believe in free market. No government program is ever effective."

In North Carolina, Dallas Woodhouse, state director of Americans for Prosperity there, told ABC News today's initiative began as a local one. "The idea was to go to district offices of the House members at noon today all across the country," he said.

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Woodhouse was leading a group of conservatives to the Raleigh, N.C., office of Sen. Kay Hagan, a Democrat.

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